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At least 343 records · Page 19
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Measurements of the 239 Pu(n,f)/ 235 U(n,f) and 238 U(n,f)/ 235 U(n,f) Cross-Section Ratios Using Quasi-Monoenergetic Neutron Beams

Neutron-induced fission cross-section ratio measurements were carried out at Triangle Universities Nuclear Laboratory (TUNL) over multiple experiment campaigns from 2021-2023. The total beam time for these measurements across all the experimental campaigns was approximately three weeks. This work was intended to serve as an independent validation of the fissionTPC cross-section ratio measurements. In contrast to the white spectrum neutron source and time-projection chamber utilized in the fissionTPC, these measurements utilized pulsed, quasi-monoenergetic neutron beams and fission ionization chambers. Therefore, this work has different sources of systematic error and can be used as a complementary measurement. In this report we describe our fission cross-section ratio measurements, analysis, results and provide a detailed uncertainty budget.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2024

Investigation of the thermal decomposition of Pu(IV) oxalate: a transmission electron microscopy study

The degradation of the internal structure of plutonium (IV) oxalate during calcination was investigated with Transmission Electron Microscopy (TEM), electron diffraction, Electron Energy-Loss Spectroscopy (EELS), and 4D Scanning TEM (STEM). TEM lift-outs were prepared from samples that had been calcined at 300°C, 450°C, 650°C and 950°C. The resulting phase at all calcination temperatures was identified as PuO 2 with electron diffraction. The grain size range was obtained with high-resolution TEM. In addition, 4D STEM images were analyzed to provide grain size distributions. In the 300°C calcined sample, the grains were <10 nm in diameter, at 650°C, the grains ranged from 10 to 20 nm, and by 950°C, the grains were 95–175 nm across. Using the Kolmogorov-Smirnov (K-S) two sample test, it was shown that morphological measurements obtained from 4D-STEM provided statistically significant distributions to distinguish samples at the different calcination conditions. Using STEM-EELS, carbon was shown to be present in the low temperature calcined samples associated with oxalate but had formed carbon (possibly graphite) deposits in the 950°C calcined sample. This work highlights the new methods of STEM-EELS and 4D-STEM for studying the internal structure of special nuclear materials (SNM).

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
DOE OSTI2020

Materials Data on PuB2Ru3 by Materials Project

PuRu3B2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are eight inequivalent Pu sites. In the first Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. Both Pu–Pu bond lengths are 2.94 Å. There are a spread of Pu–Ru bond distances ranging from 3.14–3.16 Å. All Pu–B bond lengths are 3.20 Å. In the second Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. There are a spread of Pu–Ru bond distances ranging from 3.14–3.16 Å. There are two shorter (3.20 Å) and four longer (3.21 Å) Pu–B bond lengths. In the third Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. Both Pu–Pu bond lengths are 2.94 Å. There are a spread of Pu–Ru bond distances ranging from 3.14–3.16 Å. All Pu–B bond lengths are 3.22 Å. In the fourth Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. Both Pu–Pu bond lengths are 2.94 Å. There are a spread of Pu–Ru bond distances ranging from 3.14–3.16 Å. There are a spread of Pu–B bond distances ranging from 3.21–3.23 Å. In the fifth Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. Both Pu–Pu bond lengths are 2.94 Å. There are a spread of Pu–Ru bond distances ranging from 3.13–3.15 Å. There are two shorter (3.21 Å) and four longer (3.22 Å) Pu–B bond lengths. In the sixth Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. There are a spread of Pu–Ru bond distances ranging from 3.14–3.17 Å. There are two shorter (3.21 Å) and four longer (3.22 Å) Pu–B bond lengths. In the seventh Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. There are a spread of Pu–Ru bond distances ranging from 3.14–3.16 Å. There are four shorter (3.21 Å) and two longer (3.23 Å) Pu–B bond lengths. In the eighth Pu site, Pu is bonded in a 12-coordinate geometry to two equivalent Pu, twelve Ru, and six B atoms. There are a spread of Pu–Ru bond distances ranging from 3.13–3.15 Å. There are two shorter (3.21 Å) and four longer (3.22 Å) Pu–B bond lengths. There are twelve inequivalent Ru sites. In the first Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are one shorter (2.17 Å) and three longer (2.18 Å) Ru–B bond lengths. In the second Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are two shorter (2.18 Å) and two longer (2.19 Å) Ru–B bond lengths. In the third Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. All Ru–B bond lengths are 2.18 Å. In the fourth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are three shorter (2.18 Å) and one longer (2.19 Å) Ru–B bond lengths. In the fifth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. All Ru–B bond lengths are 2.19 Å. In the sixth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are two shorter (2.18 Å) and two longer (2.19 Å) Ru–B bond lengths. In the seventh Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. All Ru–B bond lengths are 2.18 Å. In the eighth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are two shorter (2.17 Å) and two longer (2.18 Å) Ru–B bond lengths. In the ninth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are three shorter (2.17 Å) and one longer (2.18 Å) Ru–B bond lengths. In the tenth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are one shorter (2.17 Å) and three longer (2.18 Å) Ru–B bond lengths. In the eleventh Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. All Ru–B bond lengths are 2.17 Å. In the twelfth Ru site, Ru is bonded in a distorted square co-planar geometry to four Pu and four B atoms. There are two shorter (2.17 Å) and two longer (2.18 Å) Ru–B bond lengths. There are eight inequivalent B sites. In the first B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the second B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the third B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the fourth B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the fifth B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the sixth B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the seventh B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms. In the eighth B site, B is bonded in a 6-coordinate geometry to three Pu and six Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PuMnAl by Materials Project

PuMnAl is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are seven inequivalent Pu sites. In the first Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Mn, and seven Al atoms. There are a spread of Pu–Pu bond distances ranging from 3.28–3.44 Å. There are a spread of Pu–Mn bond distances ranging from 2.99–3.23 Å. There are three shorter (3.16 Å) and four longer (3.19 Å) Pu–Al bond lengths. In the second Pu site, Pu is bonded in a 9-coordinate geometry to four Pu, seven Mn, and five Al atoms. There are one shorter (2.89 Å) and two longer (3.34 Å) Pu–Pu bond lengths. There are a spread of Pu–Mn bond distances ranging from 3.03–3.24 Å. There are one shorter (3.11 Å) and four longer (3.23 Å) Pu–Al bond lengths. In the third Pu site, Pu is bonded in a 9-coordinate geometry to four Pu, seven Mn, and five Al atoms. There are one shorter (3.28 Å) and two longer (3.34 Å) Pu–Pu bond lengths. There are a spread of Pu–Mn bond distances ranging from 3.03–3.24 Å. There are one shorter (3.11 Å) and four longer (3.23 Å) Pu–Al bond lengths. In the fourth Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Mn, and seven Al atoms. Both Pu–Pu bond lengths are 3.34 Å. There are a spread of Pu–Mn bond distances ranging from 2.99–3.23 Å. There are three shorter (3.16 Å) and four longer (3.19 Å) Pu–Al bond lengths. In the fifth Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Mn, and seven Al atoms. The Pu–Pu bond length is 3.44 Å. There are a spread of Pu–Mn bond distances ranging from 2.99–3.23 Å. There are three shorter (3.16 Å) and four longer (3.19 Å) Pu–Al bond lengths. In the sixth Pu site, Pu is bonded in a 9-coordinate geometry to four Pu, seven Mn, and five Al atoms. There are one shorter (2.89 Å) and one longer (3.28 Å) Pu–Pu bond lengths. There are a spread of Pu–Mn bond distances ranging from 3.03–3.24 Å. There are one shorter (3.11 Å) and four longer (3.23 Å) Pu–Al bond lengths. In the seventh Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Mn, and seven Al atoms. There are a spread of Pu–Mn bond distances ranging from 2.99–3.23 Å. There are three shorter (3.16 Å) and four longer (3.19 Å) Pu–Al bond lengths. There are three inequivalent Mn sites. In the first Mn site, Mn is bonded to six Pu and six Al atoms to form MnPu6Al6 cuboctahedra that share corners with four equivalent AlPu6Mn4Al2 cuboctahedra, corners with fourteen MnPu6Al6 cuboctahedra, edges with six MnPu6Al6 cuboctahedra, faces with four equivalent MnPu6Mn4Al2 cuboctahedra, and faces with fourteen AlPu6Mn4Al2 cuboctahedra. There are a spread of Mn–Al bond distances ranging from 2.65–2.71 Å. In the second Mn site, Mn is bonded to six Pu, four Mn, and two equivalent Al atoms to form MnPu6Mn4Al2 cuboctahedra that share corners with eight MnPu6Al6 cuboctahedra, corners with ten AlPu6Mn4Al2 cuboctahedra, edges with two equivalent MnPu6Mn4Al2 cuboctahedra, edges with four equivalent AlPu6Mn2Al4 cuboctahedra, faces with eight AlPu6Mn4Al2 cuboctahedra, and faces with ten MnPu6Al6 cuboctahedra. There are a spread of Mn–Mn bond distances ranging from 2.67–2.77 Å. Both Mn–Al bond lengths are 2.62 Å. In the third Mn site, Mn is bonded to six Pu, four equivalent Mn, and two equivalent Al atoms to form MnPu6Mn4Al2 cuboctahedra that share corners with six MnPu6Al6 cuboctahedra, corners with twelve AlPu6Mn4Al2 cuboctahedra, edges with six MnPu6Al6 cuboctahedra, faces with eight equivalent MnPu6Mn4Al2 cuboctahedra, and faces with ten AlPu6Mn4Al2 cuboctahedra. Both Mn–Al bond lengths are 2.61 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Pu, four Mn, and two equivalent Al atoms to form AlPu6Mn4Al2 cuboctahedra that share corners with four equivalent AlPu6Mn2Al4 cuboctahedra, corners with eight MnPu6Al6 cuboctahedra, edges with six equivalent AlPu6Mn4Al2 cuboctahedra, faces with eight AlPu6Mn4Al2 cuboctahedra, and faces with twelve MnPu6Al6 cuboctahedra. Both Al–Al bond lengths are 2.74 Å. In the second Al site, Al is bonded to six Pu, two equivalent Mn, and four Al atoms to form AlPu6Mn2Al4 cuboctahedra that share corners with eight AlPu6Mn4Al2 cuboctahedra, corners with ten MnPu6Mn4Al2 cuboctahedra, edges with two equivalent AlPu6Mn2Al4 cuboctahedra, edges with four equivalent MnPu6Mn4Al2 cuboctahedra, faces with eight MnPu6Al6 cuboctahedra, and faces with ten AlPu6Mn4Al2 cuboctahedra. There are one shorter (2.67 Å) and one longer (2.81 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PuAlFe by Materials Project

PuFeAl is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are five inequivalent Pu sites. In the first Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Fe, and seven Al atoms. There are a spread of Pu–Pu bond distances ranging from 3.09–3.52 Å. There are a spread of Pu–Fe bond distances ranging from 2.94–3.24 Å. There are a spread of Pu–Al bond distances ranging from 3.09–3.18 Å. In the second Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, seven Fe, and five Al atoms. There are one shorter (2.92 Å) and two longer (3.32 Å) Pu–Pu bond lengths. There are a spread of Pu–Fe bond distances ranging from 2.96–3.23 Å. There are a spread of Pu–Al bond distances ranging from 3.03–3.18 Å. In the third Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, seven Fe, and five Al atoms. There are one shorter (3.09 Å) and two longer (3.32 Å) Pu–Pu bond lengths. There are a spread of Pu–Fe bond distances ranging from 2.96–3.23 Å. There are a spread of Pu–Al bond distances ranging from 3.03–3.18 Å. In the fourth Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, five Fe, and seven Al atoms. There are one shorter (3.09 Å) and one longer (3.52 Å) Pu–Pu bond lengths. There are a spread of Pu–Fe bond distances ranging from 2.94–3.24 Å. There are a spread of Pu–Al bond distances ranging from 3.09–3.18 Å. In the fifth Pu site, Pu is bonded in a 12-coordinate geometry to four Pu, seven Fe, and five Al atoms. The Pu–Pu bond length is 2.92 Å. There are a spread of Pu–Fe bond distances ranging from 2.96–3.23 Å. There are a spread of Pu–Al bond distances ranging from 3.03–3.18 Å. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded to six Pu and six Al atoms to form distorted FePu6Al6 cuboctahedra that share corners with four equivalent AlPu6Al2Fe4 cuboctahedra, corners with fourteen FePu6Al6 cuboctahedra, edges with six FePu6Al6 cuboctahedra, faces with four equivalent FePu6Al2Fe4 cuboctahedra, and faces with fourteen AlPu6Al2Fe4 cuboctahedra. There are a spread of Fe–Al bond distances ranging from 2.58–2.66 Å. In the second Fe site, Fe is bonded to six Pu, four Fe, and two equivalent Al atoms to form distorted FePu6Al2Fe4 cuboctahedra that share corners with eight FePu6Al6 cuboctahedra, corners with ten AlPu6Al2Fe4 cuboctahedra, edges with two equivalent FePu6Al2Fe4 cuboctahedra, edges with four equivalent AlPu6Al4Fe2 cuboctahedra, faces with eight AlPu6Al2Fe4 cuboctahedra, and faces with ten FePu6Al6 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.60–2.78 Å. Both Fe–Al bond lengths are 2.59 Å. In the third Fe site, Fe is bonded to six Pu, four equivalent Fe, and two equivalent Al atoms to form distorted FePu6Al2Fe4 cuboctahedra that share corners with six FePu6Al6 cuboctahedra, corners with twelve AlPu6Al2Fe4 cuboctahedra, edges with six FePu6Al6 cuboctahedra, faces with eight equivalent FePu6Al2Fe4 cuboctahedra, and faces with ten AlPu6Al2Fe4 cuboctahedra. Both Fe–Al bond lengths are 2.56 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Pu, four Fe, and two equivalent Al atoms to form distorted AlPu6Al2Fe4 cuboctahedra that share corners with four equivalent AlPu6Al4Fe2 cuboctahedra, corners with eight FePu6Al6 cuboctahedra, edges with six equivalent AlPu6Al2Fe4 cuboctahedra, faces with eight AlPu6Al2Fe4 cuboctahedra, and faces with twelve FePu6Al6 cuboctahedra. Both Al–Al bond lengths are 2.74 Å. In the second Al site, Al is bonded to six Pu, two equivalent Fe, and four Al atoms to form distorted AlPu6Al4Fe2 cuboctahedra that share corners with eight AlPu6Al2Fe4 cuboctahedra, corners with ten FePu6Al2Fe4 cuboctahedra, edges with two equivalent AlPu6Al4Fe2 cuboctahedra, edges with four equivalent FePu6Al2Fe4 cuboctahedra, faces with eight FePu6Al6 cuboctahedra, and faces with ten AlPu6Al2Fe4 cuboctahedra. There are one shorter (2.67 Å) and one longer (2.78 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CePu4 by Materials Project

Pu4Ce is alpha La-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are seven inequivalent Pu sites. In the first Pu site, Pu is bonded to nine Pu and three equivalent Ce atoms to form PuCe3Pu9 cuboctahedra that share corners with twelve PuCe3Pu9 cuboctahedra, edges with six equivalent CeCe6Pu6 cuboctahedra, edges with eighteen PuCe3Pu9 cuboctahedra, faces with six equivalent CeCe6Pu6 cuboctahedra, and faces with twelve PuCe3Pu9 cuboctahedra. There are three shorter (3.20 Å) and six longer (3.29 Å) Pu–Pu bond lengths. All Pu–Ce bond lengths are 3.34 Å. In the second Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuCe3Pu9 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuCe3Pu9 cuboctahedra, and faces with eighteen PuCe3Pu9 cuboctahedra. There are three shorter (3.21 Å) and six longer (3.29 Å) Pu–Pu bond lengths. In the third Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuCe3Pu9 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuCe3Pu9 cuboctahedra, and faces with eighteen PuCe3Pu9 cuboctahedra. There are three shorter (3.20 Å) and six longer (3.29 Å) Pu–Pu bond lengths. In the fourth Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuPu12 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuPu12 cuboctahedra, and faces with eighteen PuPu12 cuboctahedra. There are a spread of Pu–Pu bond distances ranging from 3.20–3.29 Å. In the fifth Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuPu12 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuPu12 cuboctahedra, and faces with eighteen PuPu12 cuboctahedra. There are three shorter (3.20 Å) and six longer (3.29 Å) Pu–Pu bond lengths. In the sixth Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuCe3Pu9 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuCe3Pu9 cuboctahedra, and faces with eighteen PuCe3Pu9 cuboctahedra. There are a spread of Pu–Pu bond distances ranging from 3.20–3.29 Å. In the seventh Pu site, Pu is bonded to twelve Pu atoms to form PuPu12 cuboctahedra that share corners with three equivalent CeCe6Pu6 cuboctahedra, corners with nine PuCe3Pu9 cuboctahedra, edges with three equivalent CeCe6Pu6 cuboctahedra, edges with twenty-one PuCe3Pu9 cuboctahedra, and faces with eighteen PuCe3Pu9 cuboctahedra. There are three shorter (3.20 Å) and six longer (3.29 Å) Pu–Pu bond lengths. Ce is bonded to six equivalent Pu and six equivalent Ce atoms to form CeCe6Pu6 cuboctahedra that share corners with six PuPu12 cuboctahedra, corners with six equivalent CeCe6Pu6 cuboctahedra, edges with six equivalent CeCe6Pu6 cuboctahedra, edges with eighteen PuCe3Pu9 cuboctahedra, faces with six equivalent CeCe6Pu6 cuboctahedra, and faces with twelve equivalent PuCe3Pu9 cuboctahedra. All Ce–Ce bond lengths are 3.29 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdPu3 by Materials Project

Pu3Nd crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are six inequivalent Pu sites. In the first Pu site, Pu is bonded in a 12-coordinate geometry to eight Pu and four Nd atoms. There are a spread of Pu–Pu bond distances ranging from 3.01–3.82 Å. There are a spread of Pu–Nd bond distances ranging from 3.42–3.49 Å. In the second Pu site, Pu is bonded to eight Pu and four Nd atoms to form distorted PuNd4Pu8 cuboctahedra that share corners with four equivalent NdPu12 cuboctahedra, corners with six equivalent PuNd4Pu8 cuboctahedra, edges with six NdPu12 cuboctahedra, faces with four NdPu12 cuboctahedra, and faces with eight PuNd4Pu8 cuboctahedra. There are a spread of Pu–Pu bond distances ranging from 3.23–3.66 Å. There are a spread of Pu–Nd bond distances ranging from 3.41–3.44 Å. In the third Pu site, Pu is bonded in a 12-coordinate geometry to eight Pu and four Nd atoms. There are two shorter (3.28 Å) and two longer (3.29 Å) Pu–Pu bond lengths. There are a spread of Pu–Nd bond distances ranging from 3.39–3.55 Å. In the fourth Pu site, Pu is bonded in a 12-coordinate geometry to eight Pu and four Nd atoms. There are a spread of Pu–Pu bond distances ranging from 3.01–3.82 Å. There are a spread of Pu–Nd bond distances ranging from 3.38–3.55 Å. In the fifth Pu site, Pu is bonded to eight Pu and four Nd atoms to form distorted PuNd4Pu8 cuboctahedra that share corners with four equivalent NdPu12 cuboctahedra, corners with six equivalent PuNd4Pu8 cuboctahedra, edges with six NdPu12 cuboctahedra, faces with four NdPu12 cuboctahedra, and faces with eight PuNd4Pu8 cuboctahedra. There are one shorter (3.36 Å) and one longer (3.57 Å) Pu–Pu bond lengths. There are one shorter (3.40 Å) and three longer (3.43 Å) Pu–Nd bond lengths. In the sixth Pu site, Pu is bonded in a 12-coordinate geometry to eight Pu and four Nd atoms. There are a spread of Pu–Nd bond distances ranging from 3.42–3.52 Å. There are two inequivalent Nd sites. In the first Nd site, Nd is bonded to twelve Pu atoms to form NdPu12 cuboctahedra that share corners with four equivalent PuNd4Pu8 cuboctahedra, corners with six equivalent NdPu12 cuboctahedra, edges with six PuNd4Pu8 cuboctahedra, faces with four PuNd4Pu8 cuboctahedra, and faces with eight NdPu12 cuboctahedra. In the second Nd site, Nd is bonded to twelve Pu atoms to form NdPu12 cuboctahedra that share corners with four equivalent PuNd4Pu8 cuboctahedra, corners with six equivalent NdPu12 cuboctahedra, edges with six PuNd4Pu8 cuboctahedra, faces with four PuNd4Pu8 cuboctahedra, and faces with eight NdPu12 cuboctahedra.

36 MATERIALS SCIENCE↗